Two-dimensional topological superconductivity candidate in van der Waals layered material

Abstract

Two-dimensional (2D) topological superconductors are highly desired because they not only offer opportunities for exploring novel exotic quantum physics, but also possesses potential applications in quantum computation. However, there are few reports on 2D superconductors, let alone topological superconductors. Here, we find a 2D monolayer W${}_2$N${}_3$, which can be exfoliated from its real van der Waals bulk material with much lower exfoliation energy than MoS${}_2$, to be a topological metal with exotic topological states at different energy level. Due to the Van Hove singularities, the density of states near Fermi level are high, making the monolayer a compensate metal. Moreover, the monolayer W${}_2$N${}_3$ is unveiled to be a superconductor with the superconducting transition temperature Tc $\sim$ 22 K and a superconducting gap of about 5 meV based on the anisotropic Migdal-Eliashberg formalism, arising from the strong electron-phonon coupling around the $\Gamma$ point. Because of the strong electron and lattice coupling, the monolayer displays a non-Fermi liquid behavior in its normal states at temperatures lower than 80 K, where the specific heat exhibit T${}^3$ behavior and the Wiedemann-Franz law dramatically violates. Our findings not only provide the platform to study the emergent phenomena in 2D topological superconductors, but also open a door to discover more 2D high-temperature topological superconductors in van der Waals materials.

References in corpus (47)

• Electric Field Effect in Atomically Thin Carbon Films
• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• Topological Insulators
• Topological insulators and superconductors
• Van der Waals heterostructures
• Phonons and related properties of extended systems from density-functional perturbation theory
• Magic-angle graphene superlattices: a new platform for unconventional superconductivity
• 2D materials and van der Waals heterostructures
• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• BoltzTraP. A code for calculating band-structure dependent quantities
• Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
• Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Maximally-localized generalized Wannier functions for composite energy bands
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Classification of topological quantum matter with symmetries
• WannierTools: An open-source software package for novel topological materials
• Gate-tunable Room-temperature Ferromagnetism in Two-dimensional Fe${}_3$GeTe${}_2$
• Maximally-localized Wannier functions for entangled energy bands
• Two-dimensional materials from high-throughput computational exfoliation of experimentally known compounds
• Electron-phonon interactions from first principles
• Colloquium: Topological Band Theory
• EPW: Electron-phonon coupling, transport and superconducting properties using maximally localized Wannier functions
• Evidence of Ising pairing in superconducting NbSe${}_2$ atomic layers
• Two Dimensional Ising Superconductivity in Gated MoS${}_2$
• Strongly enhanced charge-density-wave order in monolayer NbSe${}_2$
• Room Temperature Intrinsic Ferromagnetism in Epitaxial Manganese Selenide Films in the Monolayer Limit
• Characterization of collective ground states in single-layer NbSe2
• Topological Semimetals
• Superconductivity protected by spin-valley locking in ion-gated MoS2
• Highly crystalline 2D superconductors
• Anisotropic Migdal-Eliashberg theory using Wannier functions
• Enhanced superconductivity in atomically thin TaS2
• Superconducting density of states and vortex cores of 2H-NbS2
• Superconductivity in Few-Layer Stanene
• Charge density wave and superconducting dome in TiSe2 from electron-phonon interaction
• Nontrivial Berry phase and type II Dirac transport in layered material PdTe2
• Quasi-Particle Spectra, Charge-Density-Wave, Superconductivity and Electron-Phonon Coupling in 2H-NbSe2
• Two-dimensional topological superconductivity in Pb/Co/Si(111)
• Pristine and intercalated transition metal dichalcogenide superconductors
• Type I superconductivity in the Dirac semimetal PdTe2
• High-T_c superconductivity in ultrathin Bi_2Sr_2CaCu_2O_8+x down to halfunit-cell thickness by protection with graphene
• Experimental Observation of Topological Superconductivity and Majorana Zero Modes on beta-Bi2Pd Thin Films
• Electron-phonon coupling and the Coexistence of Superconductivity and Charge-Density Wave in Monolayer NbSe2
• Emergent superconductivity in two-dimensional NiTe${}_2$ crystals
• On the charge and magnetic ordering in monolayer NbSe${}_2$: a first principles study

Cited by in corpus (11)

• T-carbon: experiments, properties, derivatives and potential applications
• Large kagome family candidates with topological superconductivity and charge density waves
• Superconductivity in monolayer Ba${}_2$N electride: a first-principles study
• Family of binary transition metal pnictide superconductors
• Topological superconductivity and large spin Hall effect in the kagome family Ti6X4 (X = Bi, Sb, Pb, Tl, In)
• Enhanced superconductivity in C-S-H compounds at high pressure
• Strong electron-phonon coupling and predicted highest known $T_c$ of MXenes revealed in 2H-Mo${}_2$N under biaxial stress
• Two-dimensional non-van der Waals niobium nitride nanosheets with high-temperature two-gap superconductivity
• Re-entrant topological order in strongly correlated nanowire due to Rashba spin-orbit coupling
• Interfacial superconductivity in the type-III heterostructure SnSe${}_2$/PtTe${}_2$
• Influence of dislocations in multilayer graphene stacks: A phase field crystal study